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Too little bass or too much treble from product | Bose Bluetooth® audio adapter
If the sound lacks bass or has too much treble:
Try the following:
Adjust bass and treble controls on the source.
Sound quality may suffer if bass and treble controls are set to extreme levels. Try adjusting the controls to mid-range levels; this may improve sound quality. Be sure to turn off both audio enhancements and special equalizer settings found on the source
Try a different app.
If the issue only occurs with a particular app, it is likely related to the app or app settings.
Replace the cables used to connect your product
Try replacing the cables that connect your product. If no issue is heard with new cables, the first set of cables is the issue.
Reset your product.
Much like rebooting a smartphone, your product might need to be reset on occasion to correct minor issues. For more information, see Resetting your product.